Parts Needed for Herter's U9 Long Action

I just was given a Herter's U9 barreled action chambered for 7mm Rem. Magnum. Unfortunately, it is missing the trigger housing, the magazine case, and magazine spring. I have tried to obtain the parts through Numrich, but they did not have them. Would anyone know of a source for these parts or have them for sale? I can be contacted at keckha@live.com.